-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Douglas Allan Tutty wrote: >> 4) Say I have 2 physical disks. Now I can put important data on disk 1 >> and put the backups of those important data on disk 2. In this way I >> have two copies of important data on different physical devices (Only >> some (not many) of my data are /important/.) Can I do similar using LVM? > > Here's how I do it. I have two 80 GB drives. Each is partitioned > identically with three partitions: > > 1. 64 MB Used for raid1, makes md0, JFS, /boot > since grub can't read LVMs > > 2. 16 GB Used for raid1, makes md1. This one block > device is the physical volume for volume group 'system'. > Since I put the current backup in /var/local (see below), size > this > to hold the debian system plus the size of your backup > set, unless you're using streaming tape or other > direct-to-off-the-box backup setup. > > 3. remainder (64 GB), each used for PVs for volume group > 'local'. > > VG 'system' is broken up into LVs: > > root 300 MB, JFS, mounted on / > usr 4 GB, JFS, /usr > var 6 GB, JFS, /var > swap 1 GB. Yes swap is on LV on raid1. > > /tmp is on tmpfs > > This way, one drive failure doesn't cause the system to crash since even > swap is protected by raid1. > > VG 'local' right now only has one LV: > home 12 GB, JFS, /home. > This is just straight LVM, I can add a drive (PV) to VG > local and extend /home anytime. > > When I get into video editing, I'll likely create a stripped LV and > mount it somewhere, make it sticky like /tmp so user's can use it. > > /home isn't protected by raid, so one drive failing will cause data > loss (or at least trash the fs). So I run backups and store them > initialy on /var/local/backup, which is protected by raid1. I also > rsync it over to my 486. >
I see. You put /home on a separate VG and have your backup protected with RAID. RAID is also an advanced topic. > Before I started working too much on my etch box, I played with the > drives. I disconnected one to see how it gets handled and learn how to > put it back. Its just like in the HOWTO. Note, I didn't hot-unplug the > drive since the linux kernel doesn't support hotswap on SATA (or IDE). > mdadm emails you to tell you a drive failed. > >> 5) Is there an easy and supported way to convert my current disks (and >> data on the disks) to LVM? > > AFAIK, its like wanting to change your current drives to a new > filesystem: its a bit of a shell game. You can probably do it, but > personally, doing things like that is the only time I ever do a > reinstall and take the opportunity to to do it. Given the ease of > Etch's installer, its probably the easiest way. > You mean Etch's installer have a direct support of LVM in the installation process? I did not note that before. - -- Cheers, Wei Chen http://www.acplex.com/people/wchen/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFGFI8iCIqXQV6BF28RAldAAKC4oSUe0X65JGXItQxgdcbyWTDs3gCfdnDr r0Yq11ziIgDEYzo0CMTg5tY= =7xVJ -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
